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Append the keyed hash value of a file to end of the file itself. Sub AppendHash(ByVal filename As String, ByVal key() As Byte) Create a keyed hash object with given key. Dim keyhash As New HMACSHA1(key) Dim fs As FileStream Try Open the file fs = New FileStream(filename, FileMode.Open) Evaluate hash value. Dim hash() As Byte = keyhash.ComputeHash(fs) Append hash at the end of the file. fs.Write(hash, 0, hash.Length) Finally If Not fs Is Nothing Then fs.Close() End Try End Sub

The VerifyHash procedure can t use a ComputeHash method on the input stream because this method would include the hash value at the end of the file. Instead, this procedure uses a CryptoStream that wraps a NullStream object to evaluate the hash code of data as it is being read from the file, but stops reading just before the trailing hash code.

Return True if a file signed with AppendHash hasn t been modified,

Function VerifyHash(ByVal filename As String, ByVal key() As Byte, _

Figure 5-1 shows how to add a new resource to a game project. In Solution Explorer, right-click the Content item in the BigClockContent project (not the BigClock project), then select Add, New Item.

Part VII:

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Dim keyhash As New HMACSHA1(key)

Try Open the file. fs = New FileStream(filename, FileMode.Open) Create a CryptoStream that just evaluates the hash value. cs = New CryptoStream(New NullStream, keyhash, CryptoStreamMode.Write) The number of bytes in the file excluding hash at the end Dim bytesToRead As Integer = CInt(fs.Length) - keyhash.HashSize \ 8 Read the file contents while evaluating its hash code.

Dim bytesRead As Integer = fs.Read(buffer, 0, _ Math.Min(bytesToRead, buffer.Length)) If bytesRead = 0 Then Exit Do bytesToRead -= bytesRead Send data to null stream just to evaluate the hash code. cs.Write(buffer, 0, bytesRead) Loop

You can add a number of different kinds of new items to a project. Figure 5-2 shows the dialog box that lets you select the kind of item you wish to add.

cs.FlushFinalBlock()

There might be times when you want words or graphics to appear unobtrusively behind the text of a publication, usually in a pale font. For example, you might E want the word SALE to appear behind the text in a promotional yer, the word DECEMBER to appear behind the text in a menu, or your organization's logo to appear behind the text in a brochure. These faint background words and graphics are called watermarks. Watermarks are visible in a publication, but because they . are faint, they don t interfere with the readers ability to view the publication s main text. To create a text watermark: 1. Insert a text box, size it to span the page, and then rotate it to the angle you want. 2. Type the text in the text box, select it, and on the Formatting toolbar, set the font and size so that the text lls the box. 3. On the Formatting toolbar, click the Font Color arrow, and then click Fill Effects to display the Fill Effects dialog box. 4. Set the Base color to the color you want. Then click one of the three lightest Tint/Shade boxes (10%, 20%, or 30%), and click OK. OK. To create a graphic watermark: 1. Insert and size the graphic as usual. 2. On the Picture toolbar, click the Color button, and then click Washout. Washout. If you want to colorize the washed-out image you can do so on the Picture tab of the Format Picture dialog box. With Washout selected in the Color list, click Recolor, select the tint color you want, and then click OK. If you want the watermark to appear on all the pages of a multi-page publication, add it to the publication s master page.

fs.Read(storedHash, 0, storedHash.Length)

If discardHash Then fs.SetLength(fs.Length - storedHash.Length)

For i As Integer = 0 To realHash.Length - 1

If realHash(i) <> storedHash(i) Then Return False Next All bytes match, hash is verified. Return True Finally If Not cs Is Nothing Then cs.Close() If Not fs Is Nothing Then fs.Close() End Try End Function

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